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Combinatorial Chemistry & High Throughput Screening

Editor-in-Chief

ISSN (Print): 1386-2073
ISSN (Online): 1875-5402

Research Article

Compositional Analysis and Antioxidant Activities of Thymus pubescens Essential Oil from Iran

Author(s): Bahman Nickavar* and Elaheh Malekitabar

Volume 25, Issue 2, 2022

Published on: 29 December, 2020

Page: [252 - 258] Pages: 7

DOI: 10.2174/1386207323666201230091042

Price: $65

Abstract

Background: The genus Thymus is one of the well-known members of the Lamiaceae, comprising about 215 species. It is a polymorphic genus in this family. Therefore, possible differences in chemical composition among polymorphs may result in differences in their biological activities.

Objective: This study was designed to specify chemical composition in order to assess antioxidant activities and to characterize active constituents of essential oil of Thymus pubescens.

Methods: Essential oil was collected by hydrodistillation and was analyzed using GC-MS and GCFID. Antioxidant activities were evaluated by ABTS radical cation scavenging and β-carotene bleaching inhibition methods. Detection and identification of antioxidant components were performed by TLC-bioautography assay using ABTS•+ reagent.

Results: GC analyses indicated the presence of 39 components, accounting for 96.64% of total constituents, with thymol (38.67%), γ-terpinene (7.46%), and p-cymene (5.54%) as the main components. The IC50 values for antioxidant activities were equal to 1.15 (1.05 – 1.25) μg/mL and 0.45 (0.33 – 0.62) μg/mL for ABTS•+ scavenging and β-carotene bleaching inhibition tests, respectively. TLC-bioautography of oil resulted in the identification of thymol as the major antioxidant compound.

Conclusion: Essential oil exhibited very potent and significant antioxidant activities correlated well with increasing dose in vitro.

Keywords: Antioxidant activity, bioautography, chemical composition, essential oil, Lamiaceae, Thymus pubescens.

Graphical Abstract
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